TEKS.MATH.9-12.IV.D.2

What is the Normal Range of the monthly salary of teachers if the average is $4,000.00 with a standard deviation of 3,000?

• 1000-7000
• 3000-4000
• 1000-4000
• 4000-7000

Tags

TEKS.MATH.9-12.IV.D.2

The speeds of cars on the highway have a mean of 95 km/h with a standard deviation of 5 km/h. What percentage of cars averaged less than 85 km/h?

• .15%

• 2.35%

• 2.5%

• 18.5%

Tags

TEKS.MATH.9-12.IV.D.2

TEKS.MATH.9-12.V.B.1

Researches found that boys playing high school football absorb an average of 355 hits to the head with a standard deviation of 80 hits during a season.  What is the probability on a randomly selected team of 48 players that the average number of head hits per player is between 340 and 360?

• .236
• .429
• .571
• .614

Tags

TEKS.MATH.9-12.IV.D.2

What type of correlation does this graph have?

• positive

• negative

• none

• all of the above

Tags

TEKS.MATH.9-12.IV.D.2

The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

•  28,000 km and 32,000 km.
• 24,000 km and 34,000 km.
• 26,000 km and 34,000 km.
• 27,000 km and 31,000 km.

Tags

TEKS.MATH.9-12.IV.D.2

State whether you would use the central limit theorem or the normal distribution:
The weights of the eggs produced by a certain breed of hen are normally distributed with mean 65 grams and standard deviation of 5 grams.
What is the probability that one egg selected at random from a hen house will weigh more than 68 grams?

• Central Limit Theorem
• Normal Distribution

Tags

TEKS.MATH.9-12.IV.D.2

TEKS.MATH.9-12.V.B

A recent survey found that out of 400 random American adults, 89% pay their bills on time. The margin of error in this survey was 2%. What is the interval of values in which the truth is likely found?

• 89% - 91%

• 87% - 89%

• 87% - 91%

• 388 - 402

Tags

TEKS.MATH.9-12.IV.D.2

A recent survey found that 77% of high schoolers use their phones more than 4 hours a day on average. The margin of error was 3%. What is the interval for which we could expect to find the truth of the population?

• 77% - 80%

• 74% - 77%

• 74% - 80%

• 50 million high schoolers - 120 million

Tags

TEKS.MATH.9-12.IV.D.2

Expected value is

• an average.

• a predicted value of a game.

• the sum of the values multiplied by their probabilities.

• all of the above.

Tags

TEKS.MATH.9-12.IV.D.2

In the formula shown above, what does N stands for?

• sample size

• population size

• number of respondents

• number 30

Tags

TEKS.MATH.9-12.IV.D.2